Re: futexes: Still infinite loop in get_futex_key() in 2.6.31-rc4

Jens Rosenboom
2009-07-27T14:07:22Z

On Mon, Jul 27, 2009 at 03:36:52PM +0200, Peter Zijlstra wrote:
> On Mon, 2009-07-27 at 14:45 +0200, Jens Rosenboom wrote:
>
> > Good question, but as this happens on a production machine, I cannot
> > easily change the installation to check this.
>
> Uhm, but you do run .31-rc4 on it? :-)

In the hope of verifying a patch, yes. Before that we had 2.6.29.4
for some time.

> > Attaching an strace to the process gives just
> >
> > # strace -p 12886
> > Process 12886 attached - interrupt to quit
> >
> > and nothing further.
>
> Bugger.. how easy it is to reproduce?

There is a lot of stuff happening on this machine, I'm not sure
what part of it is necessary to trigger the bug. Currently it
takes anything from a couple of hours to a couple of days for
the first stuck ps to appear.